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Size-dependent Phase Transformations During Point Loading of Silicon

Published online by Cambridge University Press:  31 January 2011

A. B. Mann,
D. van Heerden,
J. B. Pethica and
T. P. Weihs
A. B. Mann
Affiliation:
Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
D. van Heerden
Affiliation:
Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
J. B. Pethica
Affiliation:
Department of Materials, Oxford University, Oxford, OX1 3PH, United Kingdom
T. P. Weihs
Affiliation:
Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
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Abstract

Using a unique combination of in situ electrical and acoustical measurements and ex situ transmission electron microscopy, the phase transformations of silicon during point loading were shown to exhibit a strong dependence on the size of the deformed volume. For nanometer-size volumes of silicon, the final phase was the body centered cubic structure BC8, but for larger volumes it was amorphous. The size dependence was explained by considering how shear stress fields vary with contact size and how interfacial effects between the silicon substrate and the BC8 phase determine its stability. For both small and large contacts the presence of a nonmetallic phase (assumed to be the Rhombohedral structure R8) was observed.

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Type
Articles
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Journal of Materials Research , Volume 15 , Issue 8 , August 2000, pp. 1754 - 1758
Copyright
Copyright © Materials Research Society 2000

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